Karting??..

Unconventional said

There's not much can be done to make drastic changes in a kart chassis.
Change how much or where it flexes or doesn't flex.
Most of those combinations have probably been tried at one time or another.
The tubing can get stressed/fatigued over the years.

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Yes, I remember that, though I wasn't a chassis guy... My last recollection was a frame with changeable 'torsion bar's' across the rear of the drivers seat. they would bolt in. Neat idea, but that was at about the same time I moved on to bracket racing.